#pragma once
#include <iostream>
#include <string>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <cstring>
#include <functional>
#include <unordered_map>
#include "log.hpp"

using func_t = std::function<std::string(const std::string &, const std::string &, uint16_t)>;
// typedef std::function<std::string(const std::string&)> func_t;

enum
{
    SOCKET_ERR = 1,
    BIND_ERR,
};
extern Log log;
std::string defaultip = "0.0.0.0";
uint16_t defaultport = 8080;
const int size = 1024;
class UdpServer
{
public:
    UdpServer(const uint16_t &port = defaultport, const std::string &ip = defaultip)
        : sockfd_(0), port_(port), ip_(ip), isrunning_(false)
    {
    }
    void Init()
    {
        // 1.创建udp socket
        sockfd_ = socket(AF_INET, SOCK_DGRAM, 0);
        if (sockfd_ < 0)
        {
            log(Fatal, "socket create error %d", sockfd_);
            exit(SOCKET_ERR);
        }
        log(Info, "socket create success %d", sockfd_);
        // 2.bind socket
        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(port_);
        local.sin_addr.s_addr = inet_addr(ip_.c_str());
        // local.sin_addr.s_addr = htonl(INADDR_ANY);
        int n = bind(sockfd_, (const struct sockaddr *)&local, sizeof(local));
        if (n < 0)
        {
            log(Fatal, "bind error,errno:%d,err string:%s", errno, strerror(errno));
            exit(BIND_ERR);
        }
        log(Info, "bind success,errno:%d,err string:%s", errno, strerror(errno));
    }
    void CheckUser(struct sockaddr_in &client, const std::string &clientip, uint16_t clientport)
    {

        auto iter = online_user_.find(clientip);
        if (iter == online_user_.end())
        {
            online_user_.insert({clientip, client});
            std::cout << '[' << clientip << ':' << clientport << "] add to online user" << std::endl;
        }
    }
    void BroadCast(const std::string &info, const std::string &clientip, uint16_t clientport)
    {
        for (const auto &user : online_user_)
        {
            std::string message = "[";
            message+=clientip;message+=":";message+=std::to_string(clientport);message+="]#";message+=info;
            socklen_t len=sizeof(user.second);
            sendto(sockfd_, message.c_str(), message.size(), 0, (struct sockaddr*)&user.second, len);
        }
    }
    void Run(func_t func)
    {
        isrunning_ = true;
        char inbuffer[size];
        while (isrunning_)
        {
            struct sockaddr_in client;
            socklen_t len = sizeof(client);
            ssize_t n = recvfrom(sockfd_, inbuffer, sizeof(inbuffer) - 1, 0, (struct sockaddr *)&client, &len);
            if (n < 0)
            {
                log(Warning, "recvfrom error,errno:%d,err string:%s", errno, strerror(errno));
                continue;
            }
            std::string clientip = inet_ntoa(client.sin_addr);
            uint16_t clientport = ntohs(client.sin_port);
            CheckUser(client, clientip, clientport);

            std::string info = inbuffer;
            BroadCast(info, clientip, clientport);
        }
    }
    ~UdpServer()
    {
        if (sockfd_ < 0)
        {
            close(sockfd_);
        }
    }

private:
    int sockfd_;     // 网络文件描述符
    std::string ip_; // 任意IP地址 bind 0
    uint16_t port_;  // 服务器端口号
    bool isrunning_;
    std::unordered_map<std::string, struct sockaddr_in> online_user_;
};
